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Fix for bug#35383: binlog playback and replication breaks

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due to name_const substitution

Problem:
"In general, statements executed within a stored procedure
are written to the binary log using the same rules that
would apply were the statements to be executed in standalone
fashion. Some special care is taken when logging procedure
statements because statement execution within procedures
is not quite the same as in non-procedure context".

For example, each reference to a local variable in SP's
statements is replaced by NAME_CONST(var_name, var_value).
Queries like
"CREATE TABLE ... SELECT FUNC(local_var ..."
are logged as
"CREATE TABLE ... SELECT FUNC(NAME_CONST("local_var", var_value) ..."
that leads to differrent field names and
might result in "Incorrect column name" if var_value is long enough.

Fix: in 5.x we'll issue a warning in such a case.
In 6.0 we should get rid of NAME_CONST().

Note: this issue and change should be described in the documentation
("Binary Logging of Stored Programs").


mysql-test/r/binlog.result:
  Fix for bug#35383: binlog playback and replication breaks
  due to name_const substitution
    - test result.
mysql-test/t/binlog.test:
  Fix for bug#35383: binlog playback and replication breaks
  due to name_const substitution
    - test case.
sql/sp_head.cc:
  Fix for bug#35383: binlog playback and replication breaks 
  due to name_const substitution
    - set thd->query_name_consts if there's NAME_CONST()
  substitution(s).
sql/sql_parse.cc:
  Fix for bug#35383: binlog playback and replication breaks 
  due to name_const substitution
    - issue a warning if there's NAME_CONST() substitution and
  binary logging is on for "CREATE TABLE ... SELECT ...".
This commit is contained in:
Ramil Kalimullin 2009-03-25 20:48:10 +04:00
parent 9536bd657b
commit bce4c76ae0
6 changed files with 125 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

40
mysql-test/r/binlog.result
View File

@ -604,6 +604,8 @@ END//
CALL p1();
c1 c2 c3 d1 d2 d3
utf8_general_ci utf8_unicode_ci utf8_unicode_ci 2 2 2
Warnings:
Warning 1105 Invoked routine ran a statement that may cause problems with binary log, see 'NAME_CONST issues' in 'Binary Logging of Stored Programs' section of the manual.
SHOW BINLOG EVENTS FROM 1285;
Log_name Pos Event_type Server_id End_log_pos Info
master-bin.000001 1285 Query 1 1483 use `bug39182`; CREATE TEMPORARY TABLE tmp1
@ -613,4 +615,42 @@ DROP PROCEDURE p1;
DROP TABLE t1;
DROP DATABASE bug39182;
USE test;
CREATE PROCEDURE p1(IN v1 INT)
BEGIN
CREATE TABLE t1 SELECT v1;
DROP TABLE t1;
END//
CREATE PROCEDURE p2()
BEGIN
DECLARE v1 INT;
CREATE TABLE t1 SELECT v1+1;
DROP TABLE t1;
END//
CREATE PROCEDURE p3(IN v1 INT)
BEGIN
CREATE TABLE t1 SELECT 1 FROM DUAL WHERE v1!=0;
DROP TABLE t1;
END//
CREATE PROCEDURE p4(IN v1 INT)
BEGIN
DECLARE v2 INT;
CREATE TABLE t1 SELECT 1, v1, v2;
DROP TABLE t1;
CREATE TABLE t1 SELECT 1, v1+1, v2;
DROP TABLE t1;
END//
CALL p1(1);
CALL p2();
Warnings:
Warning 1105 Invoked routine ran a statement that may cause problems with binary log, see 'NAME_CONST issues' in 'Binary Logging of Stored Programs' section of the manual.
CALL p3(0);
Warnings:
Warning 1105 Invoked routine ran a statement that may cause problems with binary log, see 'NAME_CONST issues' in 'Binary Logging of Stored Programs' section of the manual.
CALL p4(0);
Warnings:
Warning 1105 Invoked routine ran a statement that may cause problems with binary log, see 'NAME_CONST issues' in 'Binary Logging of Stored Programs' section of the manual.
DROP PROCEDURE p1;
DROP PROCEDURE p2;
DROP PROCEDURE p3;
DROP PROCEDURE p4;
End of 5.0 tests

40
mysql-test/t/binlog.test
View File

@ -161,4 +161,44 @@ DROP TABLE t1;
DROP DATABASE bug39182;
USE test;
#
# Bug#35383: binlog playback and replication breaks due to
# name_const substitution
#
DELIMITER //;
CREATE PROCEDURE p1(IN v1 INT)
BEGIN
CREATE TABLE t1 SELECT v1;
DROP TABLE t1;
END//
CREATE PROCEDURE p2()
BEGIN
DECLARE v1 INT;
CREATE TABLE t1 SELECT v1+1;
DROP TABLE t1;
END//
CREATE PROCEDURE p3(IN v1 INT)
BEGIN
CREATE TABLE t1 SELECT 1 FROM DUAL WHERE v1!=0;
DROP TABLE t1;
END//
CREATE PROCEDURE p4(IN v1 INT)
BEGIN
DECLARE v2 INT;
CREATE TABLE t1 SELECT 1, v1, v2;
DROP TABLE t1;
CREATE TABLE t1 SELECT 1, v1+1, v2;
DROP TABLE t1;
END//
DELIMITER ;//
CALL p1(1);
CALL p2();
CALL p3(0);
CALL p4(0);
DROP PROCEDURE p1;
DROP PROCEDURE p2;
DROP PROCEDURE p3;
DROP PROCEDURE p4;
--echo End of 5.0 tests

5
sql/sp_head.cc
View File

@ -894,6 +894,8 @@ subst_spvars(THD *thd, sp_instr *instr, LEX_STRING *query_str)
qbuf.length(0);
cur= query_str->str;
prev_pos= res= 0;
thd->query_name_consts= 0;
for (Item_splocal **splocal= sp_vars_uses.front();
splocal < sp_vars_uses.back(); splocal++)
{
@ -927,6 +929,8 @@ subst_spvars(THD *thd, sp_instr *instr, LEX_STRING *query_str)
res|= qbuf.append(')');
if (res)
break;
thd->query_name_consts++;
}
res|= qbuf.append(cur + prev_pos, query_str->length - prev_pos);
if (res)
@ -2621,6 +2625,7 @@ sp_instr_stmt::execute(THD *thd, uint *nextp)
*nextp= m_ip+1;
thd->query= query;
thd->query_length= query_length;
thd->query_name_consts= 0;
}
DBUG_RETURN(res);
}

1
sql/sql_class.cc
View File

@ -219,6 +219,7 @@ THD::THD()
one_shot_set= 0;
file_id = 0;
query_id= 0;
query_name_consts= 0;
warn_id= 0;
db_charset= global_system_variables.collation_database;
bzero(ha_data, sizeof(ha_data));

3
sql/sql_class.h
View File

@ -1556,6 +1556,9 @@ public:
sp_cache *sp_proc_cache;
sp_cache *sp_func_cache;
/** number of name_const() substitutions, see sp_head.cc:subst_spvars() */
uint query_name_consts;
/*
If we do a purge of binary logs, log index info of the threads
that are currently reading it needs to be adjusted. To do that

36
sql/sql_parse.cc
View File

@ -3211,6 +3211,42 @@ mysql_execute_command(THD *thd)
}
if (select_lex->item_list.elements) // With select
{
/*
If:
a) we inside an SP and there was NAME_CONST substitution,
b) binlogging is on,
c) we log the SP as separate statements
raise a warning, as it may cause problems
(see 'NAME_CONST issues' in 'Binary Logging of Stored Programs')
*/
if (thd->query_name_consts &&
mysql_bin_log.is_open() &&
!mysql_bin_log.is_query_in_union(thd, thd->query_id))
{
List_iterator_fast<Item> it(select_lex->item_list);
Item *item;
uint splocal_refs= 0;
/* Count SP local vars in the top-level SELECT list */
while ((item= it++))
{
if (item->is_splocal())
splocal_refs++;
}
/*
If it differs from number of NAME_CONST substitution applied,
we may have a SOME_FUNC(NAME_CONST()) in the SELECT list,
that may cause a problem with binary log (see BUG#35383),
raise a warning.
*/
if (splocal_refs != thd->query_name_consts)
push_warning(thd,
MYSQL_ERROR::WARN_LEVEL_WARN,
ER_UNKNOWN_ERROR,
"Invoked routine ran a statement that may cause problems with "
"binary log, see 'NAME_CONST issues' in 'Binary Logging of Stored Programs' "
"section of the manual.");
}
select_result *sel_result;
select_lex->options|= SELECT_NO_UNLOCK;